prepare for the release of gcc-15 expected on Friday

git-svn-id: https://svn.r-project.org/R/trunk@88163 00db46b3-68df-0310-9c12-caf00c1e9a41

Author: ripley

config.site

@@ -97,8 +97,7 @@
 ## no-return flag
 ## Header R-exts/Error.h contains alternaive definitions for the NORET
 ## macro, depending on the C standard found.  If the compiler does not
-## comply (and GCC pre=15 did not in 2024-12), use this to pick one of the
-## others, or even define to be empty.
+## comply, use this to pick one of the others, or even define to be empty.
 ## NORET=
 
 ## The following additional CFLAGS to be used only in the main

doc/NEWS.Rd

@@ -349,7 +349,7 @@
       compilation of \R and packages.  \R builds can opt out \emph{via} the
       \command{configure} flag \option{--without-C23}, unless the
       specified or default (usually \command{gcc}) compiler defaults to C23:
-      \command{gcc}\sspace{}15 will.
+      \command{gcc}\sspace{}15 does.
 
       %% GCC 13 was released in 2023-04, LLVM 18 was 2024-03, 15 was 2022-09
       %% Apple clang 14.0.3 was too old: 15 is the earliest that can be

doc/manual/R-exts.texi

@@ -3162,7 +3162,7 @@ option which selects C23 if one is available.  Some compilers (including
 later have such an option.
 
 @c GCC 14, LLVM clang 18-20 and Apple clang 16 default to C17
-@c In 2025-01 GCC pre=15 defaulted to C23 (and later documented so)
+@c In 2025-01 GCC pre-15 defaulted to C23 (and later was documented so)
 The @command{configure} script in recent previous versions of @R{} aimed
 to choose a C compiler which supported C11: as the default in recent
 versions of @command{gcc} (prior to 15), @I{LLVM} @command{clang} and
@@ -6526,7 +6526,7 @@ to @code{PKG_CXXFLAGS} will allow this, but that flag is only accepted
 by recent versions of @I{LLVM} @command{clang} (and will not be in future)
 so needs a @command{configure} test.
 
-Pre=built versions of current @command{clang}/@code{libc++} are
+Pre-built versions of current @command{clang}/@code{libc++} are
 usually available from
 @uref{https://github.com/llvm/llvm-project/releases} for a wide range of
 platforms (but the Windows builds there are not compatible with

src/include/R_ext/Error.h

@@ -35,12 +35,12 @@ extern "C" {
 /*
  * As this is sometimes an attribute, it should precede 'static' in a
  * function declaration.
- * gcc pre-15 requires it to precede 'attribute_hidden'.
+ * gcc 15 requires it to precede 'attribute_hidden'.
  * OTOH, '_Noreturn' is an obsolescent (in C23) function specifier.
  */
 #if defined NORET
 #elif (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202301L)
-// gcc 15 and clang 19-
+// gcc 15 LLVM clang 19- and Apple clang 17
 # define NORET [[noreturn]]
 #elif defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201102L
 # define NORET _Noreturn